I haven’t flown the Rebel, but I’m heavy and had a ton of lightwind gear and wanted to help with your plight.
Firstly, if you couldn’t jump with a 2015 12m Switchblade, then there either wasn’t enough wind or you may need to work on that technique, or both.
With respect to your Envy 15m experience, I know what you mean, however you may need to adjust your expectations generally for how kites 14m and over perform, especially higher aspect ones.
They can feel slow to turn and cumbersome at times, though some will jump ok, but they won’t compare to a 10m or 12m on a very windy day!
At your weight to make the most of your time available on the water you are likely to need a kite up from a 12m. The Rebel has been around a while and now as a 4 line, I wouldn’t mind a demo.
I’m sure it’ll be as good as is available out there, for what you want to do.
But the magic 14m that pulls like a train, turns like a 9m and jumps to the moon, is still in development
despite what you might read.
Demo’s are a pain and rarely do we make enough time to organise, but if you can get to try some options, then it’ll be worth the effort, even to find they all feel slow!
Good luck with whatever you choose and let us know how you get on.